[Asterisk-Users] Analog Bridged Calls Pulsate

[Steven Critchfield]

On Sun, 2004-06-06 at 15:56, Trevor Peirce wrote:
> Hello,
> 
> I've been playing around with two generic X100P analog cards to create a 
> proof-of-concept system before we go ahead and hook up a PRI.  I'm 
> running into a reproducible problem with sound quality of bridged calls, 
> and am hoping someone will be able to point me in the right direction.
> 
> I have in my dial plan a _9. extension so outgoing calls can be made... 
> the first thing is Wait(1) and then the Dial...
> 
> A call comes in to the system and the menu plays with perfect quality.  
> The call is then forwarded out the other analog line, and when answered 
> the call quality is clear.
> 
> The callee then presses # to transfer, and dials 9 then the number to 
> transfer the call to.  Immediately the call is disconnected from the 
> callee, and the caller hears hold music.  A couple seconds later when 
> the caller is transferred, call quality deteriorates.  There is a 
> pulsating noise that causes the caller and new callee to barely be able 
> to hear each other.
> 
> This happens every time and only on the 2nd call.  The first call is 
> always clear.

I bet it is a analog based problem. I can assure you the PRI doesn't
experience that kind of trouble. It is done regularly on our PRI.
-- 
Steven Critchfield <critch at basesys.com>